Air Quality in St. Catharines, Canada

Clear
19.3°C · 46.4% humidity
19.3°
Feels 19.3°
35
Good
Air quality is satisfactory. Enjoy outdoor activities.
2 stations

Nearby Monitoring Stations

AQI Forecast Calibrated
34 4pm
34
34
35 7pm
34
34
34 10pm
34
14
14 1am
7
7
7 4am
5
5
5 7am
5
4
4 10am
5
5
7 1pm
5
5
Station readings
35
34
35
36
CAMS model adj -20
54
54
54
54
54
54
54
54
34
34
27
27
27
25
25
25
25
24
24
25
25
27
25
25
AD 728×90

Air Quality Index Trend

27h · 1 stn

St. Catharines's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration.

46.4%
Humidity
12.8 km/h
Wind E
1014.9 hPa
Pressure
2.9
UV Moderate
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
35
8.3 µg/m³
PM10
25
27.4 µg/m³
050100150200300500

What is the weather forecast for St. Catharines?

Temperature & Precipitation

PM2.5 Trend

27h · 1 station
PM2.58.3 µg/m³ ✓ WHO
Good
PM1027.4 µg/m³
Good
UV INDEX2.9
Moderate
AD 300×250
Station readings (2 stations within 25 km)
8.3
Median
8.3
Average
8.2
Low
8.4
High
PM2.5 µg/m³ · Model: 13.5 · Bias: +5.2

What is the 7-day forecast for St. Catharines?

08-03
24.3° 19.3°
3.38 mm
08-04
28.9° 20.3°
5.5 mm
08-05
27.4° 16.6°
0.31 mm
08-06
23.5° 19.7°
9.06 mm
08-07
25.6° 18.5°
0.56 mm
08-08
29.0° 20.0°
08-09
30.4° 20.0°
0.13 mm
Both models agree Avg diff: 2.5°C

Where are air quality stations near St. Catharines?

36
St. Catharines, Ontario, Canada
1.4 km PM2.5: 8.6 µg/m³
30
St. Catharines, Ontario, Canada
1.4 km PM2.5: 7.2 µg/m³
42
St. Catharines, Ontario, Canada
1.4 km PM2.5: 10.1 µg/m³
35
St. Catharines, Ontario, Canada
1.4 km PM2.5: 8.4 µg/m³
35
St. Catharines, Ontario, Canada
1.4 km PM2.5: 8.4 µg/m³
39
St. Catharines, Ontario, Canada
1.4 km PM2.5: 9.4 µg/m³
34
St. Catharines, Ontario, Canada
1.4 km PM2.5: 8.2 µg/m³

What cities are near St. Catharines?

35 Thorold 35 Niagara-on-the-Lake 35 Niagara Falls 35 Niagara Falls 35 Welland 38 Grimsby 54 Grand Island 31 Port Colborne 45 North Tonawanda 31 Kenmore
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Data sources: AQI from ground-level monitoring stations via AQICN. Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-08-07T23:46 UTC.